On my site there a list of links to a podcast. It's made by using tables (not my idea) and on each cell there is just an image. Image contains a link to Spotify.

I need to add more information on each table cell so that our search engine will find them. One way to do this is using the alt-html tag at the image. I'm just wondering are there any other ways to add text that would help to find the page, but would not appear as text on the page to a visitor, and also would be search engine (Google, Bing) compatible. So that it's not viewed as trying to 'cheat' visitors to our site. AFAIK Google doesn't like the method of using <div style="display:none;">.